American website ProPublica claim that three more former members of the Nike Oregon Project (NOP) have contacted them regarding ‘inappropriate’ practices by Salazar.

This brings to 17 the number of people who have raised concerns over the past two weeks since the airing of a BBC Panorama programme.

Salazar denies all allegations made of violating anti-doping rules, but Farah is under increasing pressure to quit the NOP even though there are no suggestions of any wrongdoing by the double Olympic champion.

Scrutinised: Farah has come under increasing pressure since the allegations (Image: Getty)

Ed Warner, chairman of UK Athletics , said: “If Mo decided, having listened to the answers to his questions, that he wants to change coach or move from Oregon, we’d support him.

“If Mo said to us, for example, that actually he wants to move to New Zealand because he has a great new coach there, we would ask him questions to make sure he was making that decision in an enlightened way, but then we would support him.

“He’s an iconic athlete, he’s one of our great winners, and he remains one of our greatest prospects. We will do what we can to give all necessary support.

“In terms of his running, it’s business as usual. As I say, everybody is innocent until proven guilty. We will help Mo as best as we can with his preparations to defend his two world titles.”